Control Data Corporation CYBER 180 810 Maintenance And Parts Manual page 160

SAM 3 - FAULT INDICATORS
Assumptions: 1) PRESS RESET indicator is lit. 2) One or more other fault
indicators are lit.
0010 N y
0020
1
0030 2
0040
3
l -
0050 N y
0060
1
0070 2
0080
3
l l
0090
l
4
l -
C-8
l '
2 2
A B
WARNING
When the CB OFF indicator and one or more other
fault indicators are lit, a system backup shut down
has occurred. The system disables logic power via
the primary protection circuits without tripping
the AC TO DC CONVERTER INPUT circuit breaker.
NOTE
More than one of the temperature related fault
indicators can be on simultaneously. This can be
because of normal interaction such as low air flow
causing high outlet temperature. It can also be
the result of an open ambient thermistor or air
flow sensor.
Is the CABLE FAULT INDICATOR on?
Check for loose connectors in the cable fault loop. Refer to the
cable fault loop diagram in section 5.
Check for an open conductor in the cable fault loop.
Replace the power control borad.
Is the HIGH TEMP AIR OUT FAULT indicator on?
Determine which of the three columns has a fault indicator on.
Check the air flow (filter, blower, etc.).
Check for qpen or short (use 200k ohm scale) between pins
1
and 2
of connector which plugs into
J4
of the protect board. Remove the
connector from
J4
of the protect board before checking the
resistance.
Replace the protect board for the column with the fault.
60469500 A